SAT Math · Linear inequalities in one or two variables · medium

What is the smallest integer value of x that satisfies both x > -3 and 2x - 7 > 5?

What is the smallest integer value of xx that satisfies both x>−3x > -3 and 2x−7>52x - 7 > 5?

Answer and explanation

Answer: 7

Solve the second inequality: 2x−7>52x - 7 > 5 gives 2x>122x > 12, so x>6x > 6. The first inequality, x>−3x > -3, is weaker, because any number greater than 6 is automatically greater than −3-3. The combined solution is x>6x > 6. The smallest integer greater than 6 is 7. Notice that 6 itself does not work, since 2(6)−7=52(6) - 7 = 5, which is not greater than 5. A common wrong answer is 6, from treating the inequality as non-strict. Another is −2-2, the smallest integer satisfying only the first inequality. Both conditions must hold.

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